The 25-year-old made two terrible mistakes in the Champions League final, as the Reds lost 3-1 to Real Madrid, and has endured further errors during pre-season.

Karius fumbled a free-kick against Tranmere Rovers, and also parried Christian Pulisic's shot directly into the path of Jacob Bruun Larsen for Borussia Dortmund's third goal in their 3-1 win over the Reds in the International Champions Cup.